Did You Feel It? is a Web site produced by the U.S. Geological Survey (USGS) to tap the abundant information available about earthquakes from the people who actually experience them. By taking advantage of the vast numbers of Internet users, USGS seeks to get a more complete description of what people experienced, the effects of the earthquake and the extent of damage. With the help of citizen scientists, USGS can do this almost instantly.

By contributing experience of the earthquake, either immediately afterward, or whenever it is possible for to do so, citizen scientists will have made a contribution to the scientific body of information about this earthquake. They will also ensure that their areas have been represented in the compilation of the shaking map. This is a two-way street. Not only will citizen scientists add valuable information on the extent of ground shaking and damage, but in the process USGS hopes citizen scientists will learn more about how other communities fared and gain a greater understanding of the effects of earthquakes.